Shock-absorber.



No. 387,117. PATENTED' MAY 12, 1908.

W. PARFREY.

SHOCK ABSORBER.

APPLICATION FILED DEC. 28, 1906 UNITED STATES PATENT OFFICE.

WILLIAM PARFREY, OF NEW YORK, N. Y,

SHOCK-ABSORBER.

Specification of Letters Patent.

Application filed December 28, 1906.

Patented May 12, 1908.

Serial No. 349,781.

To all w hom it may concern: V

Be it known that I, WILLIAM PARFREY, a

subject of the King of Great Britain, residing at Newv York, in,the county and State of New York, have invented anew and useful Shock-Absorber, of which the following is a specification. N

This invention relates to devices for relieving the shock on vehicle springs, and espe- .cially in'connection with automobiles where the vehicle bodies and machinery are very :heavy; and has for its object to provide a a shock absorber comprising a shaft 3, on one end of which is secured a head 4, and intermediate of'the' ends thereof mounted a sliding sleeve 5,. Above the. shaft 3, I

'mount a plate 6, connected by a double joint 7, and two links 8, and 9, with the head 4 and sleeve 5 respectively, so that the plate 6 is free to swing, or turn in two directions, but can only move vertically by sliding the sleeve 5 in either direction on the shaft 3, as

will be understood;

Below the, shaft 3 I mount a plate 10,

which. is connected with the head 4, and

sleeve 5, by two links 11, and 12, respectively, the connection at'the ends being piv' otal so that the sleeve 5 will be free to slide alongthe shaft 3 under certain conditions, or when a sudden shock will have a tendency to throw 'thebody of the vehicle up or down, or to tilt the axle.

Mounted between a the sleeve 5 and the head 4, is a spring 13, and on the outer end of the shaft .3 is a nut 14, between which and the sleeve 5 is mounted a spring 15, so that when the sleeve 5 moves toward the head 4, it will move against the action of the spring 13, and when it movestoward the nut 14, it will move against the-action of the spring 15.

i The shaft 3 is threaded at the end so that the nut'14 may be screwed in either direction on the shaft thereby increasing or decreasing the tension of both springs at the same I as will be readily understood. It will thus be seen that I have provided a toggle joint other end free to slide along the shaft. It is evident, though, that both ends might be madesliding on the shaft 3. I

In-order that the nut 14 may be held fixed in the desired position when secured in place, I prefer to provide. the end of the nut 14 with projecting lugs 16, and I may use a cotter pin 17 through the shaft- 3, it being understood that any number of holes may be made in the shaftto allow for the different positions of the nut 14. Nhen the pin 17 is in place, it is between two sets of lugs so that the nut can not turn in either direction until the pin is removed.

In order to hold the springs 13 and 15 free from the shaft, and insure the direct action on the same. without friction on the shaft, I

' have provided the head4with a hub 18, the

sleeve 5 with hubs 19, and 20, and the nut 14, with a hub 21, all of which. are of a size to allow the springs to slip over the same and to be held thereon with slight friction.

The operation is as follows: The plate 6 may be secured to the frame of the body of the vehicle, and the plate 10 is secured to the axle, or to the spring resting on the axle so.

that the shock absorber will act with the with one end fixed on the shaft 3, and the spring of the vehicle to relieve any sudden shock from exerting its full force on the same. Should the tendency of the shock be to throw the vehicle body upward, the force would draw the sleeve 5 toward the head 4 against the action of the spring 13, but should the tendency be to throw the body of the vehicle downward, the sleeve 5 would be pressed toward the nut 14, against the action of the spring 15, so. that this construction provides against sudden shock in either direction;

and as these/"s IIIIOS 'ma be made uite P, o y

heavy, very effective means are provided to prevent any su dd en shock from exerting its full power upon the spring of the vehicle. The plate 6 being connected with the links 8 and 9 by a double joint, the body of the vehiclc will be free to cither swing, or tilt, as will be readily-understood.

While I have described the double joint connection 7, as being at the top of the shock absorber, or at he connection with the vehicle body, in m ny cases it might be desirable to make this double joint at the connection with the axle,- so that I do not confine r-aycclf to having the connection at the top,

or to having just one connection double jointed, as it may be desirable to make both connections double jointed. 7

While I have described this shock'absorber as being especially applicable to automobiles, I do not confine myself to that use, or to the use of the absorber in connection with springs, as it mightbe used in place of a spring.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent of the United States is 1. A shock absorber comprising a shaft, a toggle joint connected therewith, and springs on said shaft ada ted tolimit the movement of said joint in either direction vertically.

2. A shock absorber comprising a shaft, a

toggle joint connected therewith, and two springs on said shaft, one of said springs being within the joint, and the other spring being outside the joint, as and for the purpose set forth.

3. A. shock absorber, comprising a shaft, a stationary member connected therewith, a

movable member thereon, said members be pivotally connected with the body of the ve ole and with the axle, a spring on said shaft on each side of said movable member, and means. to regulate thetension of said springs.

4. A shock absorber comprising a shaft, a stationary member securedto one end thereof, a sliding sleeve'mounted thereon intermediate of the ends, a spring between said stationary member, and said movable memher, a nut on the end of said shaft, and a spring between said nut-and said movable member, and means to pivotall connect said connected with the body of the veh cle, and .with the axle thereof, for the purpose set forth.

6. The herein described shock absorber comprising a shaft a head fixed on one end thereof, a sliding sleeve intermediate of the ends, a nut on the end 0 posite said head, a spring betweensaid head and said sleeve, a suing between saidsleeve and. said nut, a p ate ada ted to be connected with the body of a vehic e, a double joint connected therewith, links connecting said double joint with the head and sleeve respectively, a plate adapted to be connected with the axle, and links connecting said second plate with said head and said sleeve, substantially as andfor the purpose described.

In testimony whereof I'have signed my name to this specification in the presence of two subscribing witnesses. v

, NILLL ill/l PARFREY.

'Witnesses:

GEO. 1:1. Cnossnrzr, P. VTA'N WYE. 

